... 5mil) Soldermask Clearance (b)0.1mm (4 mil)Min SMT Pad spacing (c)0.1mm (4 mil)Solder Mask Thickness0 ... conductivity aluminum plates,copper substrates, iron substrate,plug-and-aluminum plate,single-sided and double-sided PCB, FPC,FR-4,multi-layer circuit boards, ... , comparable products are widely used in lighting , communications, electronics, machinery,such as cooling demand in the field of industry ...